Wonder if they'll also be checking for the software that can rip audible audiobooks to MP3?
I did a little experiment yesterday when I saw this post. I downloaded the AAX files on my phone that I've downloaded and saved them in the same folder as my AudibleManager downloads. Although the names are obfuscated (something like B01OPIERW.aax), when I opened the "Add to Library" dialog box in AudibleManager and hovered over the file, it told me what it was. It appears to import correctly - but I'll admit it was getting late and I can't actually remember if I played it to confirm it can play.

Will have to do that when I get home tonight.